Get Alert Current Value


I am trying to update the alertlist panel to display the value of the alert. Even if the alert is not in an alerting state. I seen that there is the ‘EvalData’ field which provide the value, but as I understand it’s only filled if the alert is in alerting state, and also it just store the first alerting value of the last alerting state change (am i right ?)
So my question is : is there a way to get the current value of an alert, even if this alert is in OK state ?

Thanks for your help,